Centrifugal pumping apparatus.



l 11. KELLER.

GBNTRIFUGAL PUMPING APPARATUS.

' APPLIUATIN FILED 00T. 14, 1907.

Pah nted Nov. 14, 19,111.

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Witnesses H. KELLER. ENTRIFUGAL PUMPING' APPARATUS.

APPLICATION FILED oo'r. 14. 1907.

P: .tented Nov. 14, 1911.

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lveLoT-'z Hldreiclw Keller,

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69 rter being connected to the UNITED STATES PATENT o1 snif-nr.l

HULDREICI-I KELLER, OF BERLIN, GERMANY, ASSIGNOR T0 GENER XL ELECTRIC COM- PANY, A CORPORATION OF NEW YORK.

CENTRIFUGL PUMPING APPARATUS.

specification of Leners Patent. ramon a Nov. 1 4f, 191i.

Application filed October 14, 1907. Serial No.'397,271.

5 useful lmprovenleiits in Cei'itriilugal Pumping L\pparatus, oi which the following is a specification.

The present invention relates to centrifugal pun'iping apparatus, and has ltor its object to provide an apparat-us of improved construction which is capable of effectively withdrawing air, vapor, etc., from` the eX- haust steam oi a. reciprocating engine or a turbine as it is being condensed in a condenser, and this withoiiit an undue expenditure of power The invention :is not however limited to this particular use, being adapted for exhausting rareticd .tluidtroni any region ot' low-pres sure.

In the accompanying drawing Figure 1 shows partly in set-tion and partly 'in elevation one of the embodiments of. my invention, Fig. 2 is a similar View oi a nioditication; Fig. 3 is a section on the liuc 8MB of Fig. l; and Fig. 4 is a section on the line 4-4 of Fig. l.

Mounted upon the upper end of the main shaft l is a driving motor 2 having the usual means for sustaining the shaft in its propel.' position.

VMounted directly on the.` shaft below the motor is the impeller 3 of a throwing l air pump, and belowthatis the iinpeller 4t of a centrifugal pump which may -be of the -single or multistage type.

,have suitably shaped vanes may be located. iii-separate casings with suitable connecting conduits, or in the same casing with the necessary partitions and passages, the latter being the preferred construction. ing 5 is divided into sections so as to permit of assembling the parts. Y

Surrounding the ilnpeller of the air pump shaped outwardly-extending Vanes with passages? between. The air, vapor, cte., to bel extracted enters the chamber 8 of the pump casing through the conduit: 9, the latcondenser or other 'vessel 4from which it is desired to pump said air, Vapor-,'etc.' Water or other fluid enters the .pump chamber 10 by the conduit 11, and falls onv the impeller from which it4 65 'isthrOWn outwardly lby the Yanes as the or mechanical complication.V

The impellers which- The casis a ring (g3 containing a plurality of suitablyr latterrotatcs. The water can only act on the air after it has pasted thri'iugh tlieiin# pellet' on account otl the annular wall of the pump clnunber. i ter discharged by the mpeller enter each oi" the Vane spaces in the stationary 'ring in the forni of) pistons4 siparated by "spaces incre or less great. As this action takes The sei eral columns of'wa place the air from the chamber 8 is so to speak pocketed bctweei the water pistons and is withdrawn from. the system connected to the conduit 9. 'Ir other` words, water from the chamberlO if divided into many jets by the large number of buckets 0r vanes v on the impeller, and tl ese jetsare divided into a large number: of pistons'by .means of the Yanes or buckets in :he ring 6. The Wa'- ter particularly as it passes out Vfrom the ring (i becomes intimai ely mixed with the air.

The compressed air and the Water dis charged from the vane spaces inthe ring-G enter the annular collection Vchamber 12 and the mixed lfluids are coni-*eyedv by one or more conduits .13 thro igh the neck 14 to the iinpeller 4 ot the cintrifugal pump. It will be observed that th i conduit-s 13 and the impeller 4 are separatel fronith'e throwing pump by the partitiol 15. I

The mixture-of Iwater and air fromthe collection chamber ente "s the impeller 4 and by thelatter is forcerv outwardly through the collecting ring 1 which is'v provided with a plurality of outwardly extending 'Yanes or buckets with vane spa-ces 17 be` tween.. It is then eol'lectedin the annular chamber 1.8 and disch: rged by the cond-uit 19. The Yanes are di signed according to If it is only desirec tp raise the airf out of a vacuum'against :.trnospheric pressure,

a rule a single sta ge centrifugal 'purnpl is sutlicient. If, h'owei er, in addition to opposing atmospherie pi essure, the throwing vater has to be delivi red at any consider'- able height then two or nioreimpellers 4 are employed as showl in Fig. 2.l

The main shaft` fo:L the apparatusfmay be horizontal insteai of,l Vertical. The

pumps maybe driven separately by ysuitable motors instead of together as shown.

As regards capacity forsuction centrifugal pumps are i considerably' inferior to throwing pumps altht ugh in sonic -respects for certain conditions of service centrifugal pumps are superior tothrowing pumps. The outwardly thickened vanes of the throwlng pumps cause the throwing water to pass outwardly in individual jetrs which are separated iutopistons by the vanes ot the outer conduct-ing ring. These pistons suck the air. vapor. etc.. from the condenser or other region of low pressure and compress or condense it substantially as if they were rigid pistons. In this manner a rarefaction of the air or a degree of vacuum can be obtained which is very close to that which is theoretically possible.

The presentv invention combines thc advantages Yof th'e two pumps. namely. the superior suction action of the. throwing pump l 'withthe superior operation of the centrifugal 4pump for conveying .an

at the same time compressing or condensing to a high degree air of a certain initial specific weight or'density without great friction losses." In

other words. the invention utilizes the veryeflicilent suction action of a throwing pump to draw rarefied air or vapor, or a mixture of both. from a condenser or other region of low pressure, saidv throwing pump also compressing t-he elastic fluid drawn int-o it by such action and delivering it at a pressure that is best suited for efficient handling in the centrifugal pump by which it is dled and the working of the system of which the apparatus l'formsa part is greatly im proved.

I do notclaim herein the specific construction of parts shown in Figs. 3 and 4 of the d rawing.- but use them merely as illustrations of suitable structures that may be incorporated in luy improved pumping 'apparatus. The structure illustrated in Fig. 3 is claimed in my United States Patent No. 987.994. dated- March Q8. 1911.

- In accordance with the provisions of the patent statutes.. I have described the principlel ofioperation of my invention toget-her with the apparatus which I now consider to represent the best-'embodiment thereof: but I desire to have it understood that the ap .paratus shown is only illustrative. and that theinvention can be carried out by other' 1*. In an apparatus of the character escribed. the combination of a throwing is drawn by suction into the casing of said pump from a region of relatively low pressure. al conduit which admits liquid to the impeller of the throwingr pump for coperation therewith to draw in elastic fluid through the first conduit and increase its density. a centrifugal pump 4which draws the compressed fluid from the discharge of the throwing pump. and a delivery conduit for said centrifugal pump.

Q. In an apparatus of the character de scribed. the combination of a throwing pump. a conduit through which elastic fluidl is drawn b v suction into the pump casing from a region of relatively low pressure. a conduit which supplies liquid to the pump impeller for coperating with the pump to draw in elastic fluid from the first conduit- -and increase its density. means arranged to 'receive the liquid and the compressed elasticl fluid from the pump. a centrifugal pump which draws its supply from the contents of said means and increases its pressure. and a discharge conduitfor said centrifugal pump.

3., In an apparatus of the character described. the combination of a throwing pump. acentrifugal pump arranged to receive the discharge therefrom. a casing common to the pumps. a conduit for supplying liquid to the impeller of the throwing pump. a conduit A through which elastic fluid drawnby suction into the casing of the throwing pump from a region of relatively low pressure. said fluid being compressed by the liquid to a degree sufficient to enable it to be handled efliciently by the centrifugal pump. a conduit through which the discharge of the throwing pump is drawn into the centrifugal pump. and a discharge conduit for the latter pump.

4. In an apparatus of the character des scribed, the combination of a throwing pump. a multi-stage centrifugal pump which `receives the discharge o f the throwing pump. a conduit for supplying liquid to -the impellcr of the throwing pump. a conduit through which elastic fluid is drawn by suction into the casing of the throwing pump from a region of relatively low pressure. a discharge conduit for the centrifugal pump. and a shaft that is common to the impellers of bot-h pumps.

5. In an. apparatus of the character described. t-he combination of an impeller, a. ring receiving the discharge therefrom'. vanes in said ring, a conduit admitting liquid to the receiving ends of theimpeller vanes. ay conduit through which elastic fluid is drawn by suction from a., region 'of relatively low pressure and passes to the receiv ing ends of the vanes in the ring to be vcomoressed therein by liquid thrown from the impeller. a casing for the impeller and ring containing a 'collection chamber. a centrifu-l gal pump having a casing. s. conduit through he shaft having a suctionlinlet adjacent@ iaid shaft and passages leading therefrom :o the periphery of ,the impeller, a ring surrounding the, impellerfand provided with'M passages into which 'it discharges, a casin for the pump having a chamber in whic the impeller rotates, a suction chamber adiacent the suction inlet, a diaphragm arranged adjacent the impeller on the side opposite to the suction chamber, an annular chamber surrounding the ring into which the pump discharges, and a dischar outlet leading from sai plying liquid to said suction chamber, 1 a conduit connected with the impeller cham liquid in the chamber, a con uit sup-- drawn from a region of relatii eLY low ressure and compressed b the' victiono the pressed Huid being discharge From the ring into said annular chamber, :i centrifugal discharge outlet of the annular chamber, there being' passages in the c: sin between the outer wall thereof and tl e diaphragm leading from said annular ch amber to the 4discharge outlet, a casing for t] Le centrifugal r the throwing pump, and a vdisc iarge conduit leading from said casing. l l

i In Witness whereof, I have hereunto set my hand this 19th vday o'SeI tember, 1907.

I'IULDREICH` KELLER.

Witnesses:

E. PAUL WAGNER, `HANS REINECKE.

pump which is connected'to :he casing of.

ber through which rareiedelastic fluid is i ump, t e li uid andcomp pump having a suction inlet adjacentv the 

